Spray head



April 14, 1931;

G. A. MUELLER SPRAY HEAD Filed A ril v, 1927 Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE.

GODFREY A. MUELLER, POINT PLACE, OHIO, ABSIGNOB TO THE D]! VIL'BISB COI- PANY, OI TOLEDO, OHIO, A CORPORATION 01' OHIO SEBAY HEAD Application filed April 7, 1927. Serial No. 181,858.

This invention relates to devices for the spraying of surface coating materials, and particularly to spray-heads therefor of the supplemental air discharge or fan spray type;

a and it has for its object the provision of a spray-head of this character havlng certain novel and advantageous features of construction.

The invention is fully described in the fol- 1o lowing specification and one embodiment thereof illustrated in the accompanying drawings, in which,

Figure 1 is a central longitudinal section of a spray-head embodying the invention with a part broken away. Fig. 2 is a front end view thereof. Figs. 3, 4 and 5 are cross-sections, respectively, on the lines 3-3, 44 and 55 in Fig. 1, with the union nut removed from Fig. 3 and with a part in Fig. 4

broken away.

Referring to the drawings, 1 designates the inner or material discharge nozzle of the spray-head, such nozzle, in the present instance, being integral with and projecting centrally from the forward end of body part 2 and adapted to be attached to a gun or holder (not shown) so that said body and nozzle form a rigid part thereof. The nozzle throat 3, which extends back through the body part 2, has communication with a source of supply of material to be sprayed. The body 2 forms an annular forwardly facing shoulder at around the inner end of the nozzle l in concentric relation thereto, and, in the present instance, undercut to form an inwardly tapering seat. The body 2 at the rear of the shoulder 4 is provided with a rearwardly facing annular shoulder 5 for receiving the thrust of the rear inwardly flanged end of a union nut 6.

A supplemental nozzle 7 has its throat considerably larger than the nozzle 1 and disposed therearound with its rear end seatmgb against the shoulder 4c of the body part eing firmly held thereto by the engagement therewith of the union nut 6. The throat of the nozzle 7 is of conical form to provide a gradual forward restriction thereof and its outer end is considerably larger than the portion of the inner nozzle 1 WhlCh it surrounds. The nozzle 7 terminates short of the outer restricted end of the nozzle 1. The inner conical wall of the nozzle 7 is provided with an annular groove 8, and extending outwardly and forwardly from such groove in diametrically opposed relation, through ears 9 on the nozzle member, are angled supplemental air discharge passages 10, the outer ends of which are disposed to direct air streams therefrom in converging relation with the point of meeting of the streams falling in the axis of discharge of material from the inner nozzle 1, thereby effecting a flattening of the main spraying stream, as well understood in the art.

A combination valve and main air discharge nozzle 11 has a conical outer surface fitting the conical throat portion of the supplemental nozzle 7 and adapted to have turning movements therein while the inner throat portion of the nozzle 11 is spaced throughout its length from the outer side of the inner nozzle 1 to provide an air passage therebetween, and has its outer end restricted around the reduced outer discharge end of the nozzle 1 to form a restricted annular air discharge orifice 12 around the outer end of the inner nozzle. A nut 13 is threaded on the outer end of the nozzle 11 and has yielding coaction through the medium of a spring washer 14 with the forward end of the supplemental nozzle 7 to effect a yielding holding of the nozzle 11 to its seat in the outer nozzle, at the same time permitting one to turn within the other.

The space 15 around the inner nozzle 1 and within the nozzles 7 and 11 forms an air supply space and is in communication with a source of air pressure supply through one or more passages 15 in the body part 2. Communication may be provided between the space 15 and supplemental air receiving groove 8 in the nozzle member 7 .through an offset or side out 16 in the rear wall of the groove 8. In order that the nozzle member 11 may act as a valve for regulating the passa e of air to the groove 8 from the space 15, t e rear end of the nozzle 11 is cut or formed on a spiral or taper so that when the member 11 is in one 8 is entirely covered and closed, and when the member 11 is moved in one direction from such position the space 16 is gradually opened by reason of the tapered form of the nozzle member end. It is thus apparent that by a turning of the nozzle member 11 a perfect regulation of the supplemental discharging air, both as to pressure and quantity, may be obtained, orsuch air may be entirely shut ofi if it is not desired to use the supplemental air discharge feature, as in,

the case Where a round spray is desired. A stop-pin or lug 17 is provided on the inner side of the supplemental nozzle 7 for stop coaction With a shoulder 18 of the member 11 to limit the opening movement of said member.

When it is desired to change the plane 0 flattening of the main spray stream, the union-nut 6 is loosened slightly to permit such turning and is then tightened to hold the supplemental nozzle in adjusted position. During a turning of the supplemental nozzle the air nozzle 11 turns therewith, so that there is no change in the relative adjustment of the nozzles 7 and 11 by reason of the turning of the former. i

It is apparent with this construction of spray-head that the main air nozzle 11 is carried by the supplemental nozzle 7 and that in addition to forming the main air discharge orifice it also serves as the valve member for regulating the discharge of air from the supplemental air discharge passages 10 of the nozzle 7. I

I wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: v

1. In a spray-head, a body part having a material discharge nozzle projecting therefrom and having an annular sea-t around said nozzle, a supplemental nozzle seating against the annular seat of said body part and having supplemental air discharge passages, means for securing the supplemental nozzle to its seat, and a main air nozzle car ried by the supplemental nozzle for relative turning movements therein and forming a main air discharge orifice around the discharge end of the inner nozzle, said main air nozzle cooperating with the supplemental nozzle to regulate the quantity of discharge of air from the supplemental nozzle and the main and supplemental nozzles being rotatable together relative to the inner nozzle.

2. A spray-head having a body part, an inner material discharge nozzle projecting from said body part, an outer supplemental nozzle encircling said inner nozzle in spaced relation thereto and seating against said body part, said outer nozzle having supplemental air discharge passages, means securing the outer nozzle and body part together and adapted to permit relative rotary nonaXial movements thereof, an intermediate nozzle carried by and rotatably mounted within the outer nozzle and forming a restricted air discharge orifice in surrounding relation to the discharge end of the inner nozzle, said intermediate and outer nozzle having cooperation so that a relative turning thereof controls the quantity of discharge of air from the supplemental passages. 1

3. A spray-head having a body part, an inner material discharge nozzle and an outer supplementalair discharge nozzle carried by and projecting from said part and forming an air space therebetween adapted to have communication with a source of air pressure supply, said outer nozzle having supplemental air discharge passages, and a main nozzle member carried by the outer nozzle within said space and being rotatable relative to the outer nozzle and cooperating therewith to control the communication between said air supply space and said supplemental passages, whereby the quantity of supplemental air discharge is regulated, said main nozzle also forming a main air discharge orifice in encircling relation to the discharge end of the inner nozzle.

4. In a spray-head, a body part, an inner material discharge nozzle and an outer supplemental nozzle projecting in spaced encircling relation from the forward end of said body part and forming an air supply space therebetween adapted to have communication with a source of air pressure supply, said outer nozzle having an inner conical surface with its small end forward and having supplemental air discharge passages in communication with said supply space through said conical surface, a conical valve member rotatably mounted within and carried by the outer nozzle and cooperating Nil therewith to control the communication between said supply space and supplemental passages, said valve member'also cooperating with the discharge end of the inner nozzle to form a restricted air discharge orifice therearound.

5. In a spray-head, a body part, an inner material discharge nozzle and an outer supplemental nozzle projecting in spaced encircling relation from the forward end of said body part and forming an air supply space therebetween adapted to have communication with a source of air pressure supply, said nozzles being relatively rotatable without axial movements and said outer nozzle having an inner conical surface with its air discharge passages in communication with said supply space through said conical surface, a conical valve member carried by and rotatably mounted within the outer nozzle and cooperating therewith to regulate the communication between said supply space and supplemental passages to vary the quantity of air supply to the latter, said valve member also cooperating with the discharge end of-the inner nozzle to form a restricted air discharge orifice therearound, and means carried by the outer end of the valve member and yieldingly co-acting with the forward end of the outer nozzle to retain the valve member seated therein.

6. In a spray-head, a body part, an inner material discharge nozzle and an outer su plemental nozzle projecting from said b0 y part in encircling relation and forming a space therebetween adapted to have communication with a source of air pressure supply, and a member carried by and rotat ably mounted within the outer nozzle and cooperating therewith to control the supplemental discharge of air therefrom and also cooperating with the inner nozzle to form a main air discharge orifice from said supp? space.

7. n a spray-head, a body part, an inner material discharge nozzle and an outer supplemental air discharge nozzle projecting from said body part-in encircling relation and forming a space therebetween adapted 'to have communication with a source of air pressure supply, said outer nozzle being rotatably ad ustable with respect to the body part and inner nozzle, and a combination valve and nozzle member carried interiorly by said outer nozzle and rotatably cooperating therewith to control the supplemental discharge of air from said space through said outer nozzle and also cooperating with the inner nozzle to form a main air discharge orifice from said supply space in encircling relation to the discharge end of the inner nozzle. 8. In a spray-head, a body part, an inner material discharge nozzle. and an outer suplemental air discharge nozzle projecting rom said body part in encircling relation and forming a space therebetween adapted to have communication with a source of air pressure supply said outer nozzle bein rotatably adjustable with respect ,to the body part and inner nozzle without axial movements-relative thereto and having air dis charge passages and a port in its inner surfacein communication with said passa es, and a combination valve and nozzle mem er carried interiorly by said outer nozzle and rotatable relative thereto, said valve member having an axially tapering surface cooperating with said port by a relative turning of the outer nozzle and valve member to shut off or regulate the quantity of air supply to said In testimony whereof I have hereunto signed my name to this specification.

GODFREY A. MUELLER. 

